Beaches of Cadiz

Río, Laura Del; Benavente, Javier; Prieto, Francisco Javier Gracia; Anfuso, Giorgio; Aranda, M.; Montes, Juan; Puig, María; Talavera, Lara; Plomaritis, Theocharis A.

doi:10.1007/978-3-319-93169-2_14

Cited by 5 publications

(5 citation statements)

References 38 publications

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“…The bars have a seasonal behavior and their position is influenced by the rocky outcrop [36]. The shoreline position is stable, with long-term erosion rates below 0.75 m/yr [37].…”

Section: Methodology 21 Study Site: Victoria Beachmentioning

confidence: 99%

The Influence of Camera Calibration on Nearshore Bathymetry Estimation from UAV Videos

et al. 2021

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Measuring the nearshore bathymetry is critical in coastal management and morphodynamic studies. The recent advent of Unmanned Aerial Vehicles (UAVs), in combination with coastal video monitoring techniques, allows for an alternative and low cost evaluation of the nearshore bathymetry. Camera calibration and stabilization is a critical issue in bathymetry estimation from video systems. This work introduces a new methodology in order to obtain such bathymetries, and it compares the results to echo-sounder ground truth data. The goal is to gain a better understanding on the influence of the camera calibration and stabilization on the inferred bathymetry. The results show how the proposed methodology allows for accurate evaluations of the bathymetry, with overall root mean square errors in the order of 40 cm. It is shown that the intrinsic calibration of the camera, related to the lens distortion, is the most critical aspect. Here, the intrinsic calibration that was obtained directly during the flight yields the best results.

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“…The bars have a seasonal behavior and their position is influenced by the rocky outcrop [36]. The shoreline position is stable, with long-term erosion rates below 0.75 m/yr [37].…”

Section: Methodology 21 Study Site: Victoria Beachmentioning

confidence: 99%

The Influence of Camera Calibration on Nearshore Bathymetry Estimation from UAV Videos

et al. 2021

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“…On the other hand, even though the easterly winds are more intense and, thus, favorable for dune formation (low moisture content and high speeds), their generating capacity is limited, as they blow almost parallel to the coast. Accordingly, the Camposoto dunes, as well as most of the dunes in the littoral of Cadiz, are formed via westerly winds, which blow perpendicularly and/or obliquely to the coast (Figure 2B; [42]).…”

Section: Study Areamentioning

confidence: 99%

High-Resolution Interannual Evolution of the Dune Toe at a Mesotidal Barrier (Camposoto Beach, SW Spain)

Montes,

Benavente,

Puig

et al. 2024

JMSE

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Over recent years, processes related to marine storms, sediment shortages and human intervention have caused the global retreat of many coastal systems and the degradation of their dunes. In this context, changes in the dune toe are commonly used as a proxy to study the interannual shoreline evolution, and it is usually analyzed using orthophotography, while high temporal- and spatial-scale resolution studies of dune toe evolution are not frequent. In this work, a quasi-monthly study of dune toe data was carried out between 2008 and 2018. These data, taken from the RTK-DGPS and UAS systems, were subjected to shoreline analysis, and they showed an average regression rate of −2.30 m/year, a higher value than the one registered until 2008 (1 m/year). This suggests an acceleration in the erosion suffered within the system, which was revealed to be more intense in the northern sector of the study area. Dune toe variability increased over the years, probably due to the presence of washover fans breaking the foredune that were reactivated and expanded during storm events. The ephemeral progradation of the dune toe was also noted, which could be explained with reference to wind events and/or beach nourishment that had been carried out over the studied period. From the analysis of the dune toe elevation, a decrease in this variable was obtained, especially in the areas affected due to washover fans. This finding is supported by the significant correlation of the dune toe elevation and erosion trend, suggesting that the areas where the dune toe was lower are prone to suffering a greater retreat. This correlation provides insight into the future evolution of the barrier, suggesting a state of degradation and a transition to a lower-resilience state.

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“…Regarding the meteorology, the Guadiaro river is characterized by its irregular and strong dependence on rainfall regime and torrential character [11,53,54], the sand spit behavior being strongly dependent on the river, and by the sea being dependent on E winds and consequent wave behavior [11]. On the other hand, Sotogrande beach suffers from chronical erosion trends, having a regression by more than 160 m which was evident between 1960 and 2000, and is still going (−3.1 m/year) [55]. This implies an increase in vulnerability to climate change due to forecasts of increased wave energy [9][10][11]56].…”

Section: Study Areamentioning

confidence: 99%

“…For the Guadiaro river mouth, the sand spit, and the surrounding beaches, we achieved the following results: (1) regarding the sand spit, especially in 2020 it remained closed throughout the summer season, most likely associated with the COVID-19 pandemic, during which many international tourists were not able to visit Sotogrande, reducing anthropogenic pressure, including urban waste; (2) through climatologies we evaluate how additional small sand bars could be caused by the northward longitudinal current blocked after the construction of Sotogrande harbor; (3) [55] replenishing of beaches can also be detected and monitored by means of S2 images, as demonstrated in the variability of the beach to the south of the Port of Sotogrande in 2017; and (4) the land-sea interface of sandy beaches is more easily identified in different studies throughout the globe compared to rocky beaches or coastal cliffs [36,61,73,74], mostly due to image spatial resolution [75]. However, while S2 undoubtedly enhanced its spatial resolution up to 10 m and, consequently, enhancing the rocky beach delineation, other effects, such as the presence of natural areas of water accumulation on the rocky beach, can lead to misinterpretation, as happened on the Torreguadiaro beach.…”

Section: Contributions To Coastal Managementmentioning

confidence: 99%

Monitoring Sand Spit Variability Using Sentinel-2 and Google Earth Engine in a Mediterranean Estuary

Roca

Navarro

Sanabria³

et al. 2022

Remote Sensing

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Estuarine degradation is a major concern worldwide, and is rapidly increasing due to anthropogenic pressures. The Mediterranean Guadiaro estuary, located in San Roque (Cadiz, Spain), is an example of a highly modified estuary, showing severe negative effects of eutrophication episodes and beach erosion. The migration of its river mouth sand spit causes the closure of the estuary, resulting in serious water quality issues and flora and fauna mortality due to the lack of water renewal. With the aim of studying the Guadiaro estuary throughout a 4-year period (2017–2020), the Sentinel-2 A/B twin satellites of the Copernicus programme were used thanks to their 5-day and 10 m temporal and spatial resolution, respectively. Sea–land mapping was performed using the Normalized Difference Water Index (NDWI) in the Google Earth Engine (GEE) platform, selecting cloud-free Sentinel-2 Level 2A images and computing statistics. Results show a closure trend of the Guadiaro river mouth and no clear sand spit seasonal patterns. The study also reveals the potential of both Sentinel-2 and GEE for estuarine monitoring by means of an optimized processing workflow. This improvement will be useful for coastal management to ensure a continuous and detailed monitoring in the area, contributing to the development of early-warning tools, which can be helpful for supporting an ecosystem-based approach to coastal areas.

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Beaches of Cadiz

Cited by 5 publications

References 38 publications

The Influence of Camera Calibration on Nearshore Bathymetry Estimation from UAV Videos

The Influence of Camera Calibration on Nearshore Bathymetry Estimation from UAV Videos

High-Resolution Interannual Evolution of the Dune Toe at a Mesotidal Barrier (Camposoto Beach, SW Spain)

Monitoring Sand Spit Variability Using Sentinel-2 and Google Earth Engine in a Mediterranean Estuary

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